This widget is available in the free version of WPmozo Addons for Elementor. To add rotating text effects and highlight important messages on your site, simply install and activate the WPmozo Addons Lite plugin. Download link:

https://wordpress.org/plugins/wpmozo-addons-lite-for-elementor

How to add widget on page

Once the WPMozo Addons plugin is activated, it adds a number of widgets to the Elementor builder. To insert the widget, use the following steps.

1. Create/edit a page/post that uses Elementor builder.
2. Create/edit container.
3. Search widget Rotating Text under WPMozo.